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Climate Change Killed The Aliens. Stupid Humans.

from Discovery

Why Can’t We Find Aliens? Climate Change Killed Them

BY IAN O’NEILL

As we look deeper into our galaxy for signs of extraterrestrial life, we keep drawing a blank. Does this mean life on Earth is unique and we’re the only ones out here? Or could it just mean that all the aliens are dead?

Fresh on the heels of the recent news surrounding the increasingly dire climate forecast for our planet, comes a possible warning from the cosmos: climate change in extraterrestrial environments is inevitable and, should life on hypothetically habitable worlds not act as a stabilizer for their environments, it serves as a “sell-by” date for all burgeoning lifeforms.

In new research published in the journal Astrobiology, astronomers of The Australian National University (ANU) pondered this scenario and realized that young habitable planets can become unstable very quickly. What once was a life-giving oasis becomes a hellish hothouse or frozen wasteland very quickly.

“The universe is probably filled with habitable planets, so many scientists think it should be teeming with aliens,” said Aditya Chopra, lead author of the paper. “Early life is fragile, so we believe it rarely evolves quickly enough to survive.”

“Most early planetary environments are unstable. To produce a habitable planet, life forms need to regulate greenhouse gases such as water and carbon dioxide to keep surface temperatures stable,” he said.

PHOTOS: How Aliens Can Find Us (and Vice Versa)

Unlike Earth, most worlds will likely not find this balance, ultimately succumbing to being cooked by a runaway greenhouse effect (like Venus) or frozen by a thinning atmosphere (like Mars). Life will often not be fortunate enough to win the race against environmental fluctuations to become a stabilizing factor.

[ click to continue reading at Discovery ]

Posted on January 25, 2016 by Editor

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